code: def list_of_tuples(arr):
      return [(i, -i) for i in arr]
  
imports: import numpy
  from pandas import DatetimeIndex, Index, MultiIndex, Series, Timestamp, date_range
  from .pandas_vb_common import setup
label_desc: Use image node_id 5 for calling a global function with example usage: list_of_tuples(arr) and returns: unknown